| Petroleum has become a problem of energy and environment with the development of social. At the same time, the exhaust emission from automobiles has become one of important polluted source to cities'environment, with the increasing of the amount of automobile. Moreover, the petroleum consumption is increasing quickly with the amount increasing of automobile. The biomass-based alternative fuel, which is proved to improve energy problem and help lessen the tail gas emission to environment. By setting up the plant,more chance can be challenged for farmers and other operators, and thus contribute to agricultural economy.The mass production and application of a new kind of fuel would inevitably cause extensive impacts on the local economy, energy structure, environmental and ecological balance and so on. Considering the various economic and social conditions across the country, projects based the same feedstock could result different effects.This research showed that a comprehensive life cycle assessment with biomass-based fuel DME in YunNan of China, with respects to its economic,energy and environmental feasibility. The analysis results would serve to suppot as the decision-making.The basical studied contain:First, life cycle cost,energy consumption and environment emissions assessment mathematic model for China fuel DME were established for the first time, by using life cycle assessment theory, and considering the life cycle process and system characteristics of fuel DME. Then, life cycle inventoty analysis model was establishied based on the mathematic model, and detailed implement step and method of each part were discussed.The life cycle impact model of fuel DME was establishied for the first time in China after defined its life cycle environmental inpact kinds elementarily and gained the weights of each impact kind by AHP and expert consultation, and the classification, characterization, and valuation method and implement step were discussed in detail.Fuel's SCNE indicator for assessing its life cycle cost, energy consumption, and environment impact as a whole was putted forward, and the calculate method was batted around.By life cycle optimization,the life cycle objective function design variables and restriction conditions were discussed in detail.As the example of Corn stover-Forest tree (fuel forest) fuel DME was used as a study for LCA in Yunnan.The main conclusion as follow:1. The cost of three kinds of biomass matierials is different, the cost of corn-stover is the lowest, forest residual is lower, forest tree is the last.2. Compared with tradition fuel (gasoline,disel and ethanol), life cycle fuel total energy consumption of DME would be increase 59.16%,67.91% and 51.54% respectively, and fossil fuels and petroleum consumption would reduce 72.13%,68.87%,75% and 56.57%,52.22%,56.02%,and tail gas emissions pollutant of automobile, would be reduced markedly. The value of DME fuel's life cycle impact general indicator is 3.03×10-5 person/km. And it would achieve 60.73% impact during "vehicle operation". The value of DME's SCNE is 5.81×10-3 RMB/km, and its SCNEC is higher thangasoline's SCNE, by 89.91% and higher than etanol's SCNEC, by 88.81%.Developing new DME production technology with higher efficienct and reduce its production cost at the same time is the main approach to reduce its SCNE. Along with the gasoline,diesel consumptions'enlargement and petroleum'deposited reduction, the gasoline or diesel's SCNEC is only getting higher and higher. Simultaneously, considered that DME production technology the progressand its renewability, DME would be one of potential subsititutes for gasoline.3. The best proportion is x24=0.963 637, x25=0.036 363,x26=0, biomass cost,energy consumption and gas emission as restrict cell,the proportion of all kinds of biomass as changing cell. It is proved by graphs of DME's cost,energy consumption and gas emissions(Sees the Figure5-5-Figure5-23). The consumption of electricity energy in fuel stage is the key factor to cost objective function and its life cycle VOC,NOx,CO,PM,SOx emissions; the petroleum consumption and trspotation distance are the key factor to GHGs emissions.The model and methodology established could be used on implementing life cycle assessment, life cycle sensitive analysis for objective function, and SCNE assessment of fuel DME. And it could be supply reference and example for similar researches. The data information on life cycle inventory, life cycle impact assessment,SCNE and life cycle sensitive analysis results of fuel DME could supply theory and data reference for lecision-making on promoting fuel DME in Yunnan. Moreover, it could be used on other feedstock fuel's life cycle assessment,sensitive analysis and supplying reference for the government on making policy and tax policy. |
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